Our thin-wall transparent fluoropolymer FEP tubing is manufactured from special virgin grade thermoplastic FEP fluoropolymer. Unlike PTFE tubing, this material can be heat sealed. This property offers extremely large possibilities for packaging and/or storage of samples (corrosives, liquids, solids, etc.). Our fluoropolymer tubing can also be used where snug and tight fit over glass or metal tubing is required. Sold in sections of 305 mm (12") long. There are 4 sections contained in each package. The number after "TWT" indicates I.D. size in mm. (For example, TWT-5 has an inside diameter of 5 mm).